Hello,
I read some discussions about UV / clear filters for the 17-40L and wanted to share my experience.
I recetnly purchased 5DIII + 17-40L + B+W Filter UV (010) XS Pro Digital MRC Nano D77mm.
Yes, though it's a slim filter you CAN still attach the original Canon lens cap provided with the 17-40L. But the lens cap does NOT fit completely. It's like if you try to put something 10cm long into a hole of 9,5cm long. It works but not completely...
The problem : the DSLR is stocked all day in a toploader pointing down. And there was a pressure on the lens cap. 3 days ago, I found completely broken. And I could CLEARLY see that the starting point of the broken zone is on the border where the lens cap pushed...
Now, I'll buy a F-Pro mount...
Just to share my experience...
Cheers,
